SIOLOGY 



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observation was made by Schaudinn in the heliozoan Camptonema in 

 which several axopodia anastomose to capture a prey (Fig. 214, d). 

 In the holozoic Mastigophora, such as Hypermastigina, which do 

 not possess cytostome, the food-ingestion is by import or invagina- 

 tion as noted in Trichonympha campanula (Cleveland, 1925a; Emik, 

 1941) (Fig. 35, a) and Lophomonas blattarum (Kudo, 1926). 



The food particles become attached to the pseudopodium and are 

 held there on account of the viscid nature of the pseudopodium. The 

 sudden immobility of active organisms upon coming in contact with 

 pseudopodia of certain forms, such as Actinophrys, Actinosphaer- 

 ium, Gromia, Elphidium, etc., suggests, however, probable discharge 

 of poisonous substances. In the Suctoria which lack a cytostome, the 

 tentacles serve as food-capturing organellae. The suctorial tentacle 



Fig. 34. 



Rhizopodium of Lieberkiihnia, capturing and digesting 

 Colpidium colpoda (Vervvorn). 



bears on its distal end a rounded knob which, when it comes in con- 

 tact with an actively swimming ciliate, stops the latter immediately 

 (Parapodophrya typha, Fig. 369, a). The prehensile tentacles of 

 Ephelotidae are said to be similar in structure to the axopodia, in 

 that each possesses a bundle of axial filaments around a cytoplasmic 

 core (Roskin, 1925). These tentacles are capable of piercing through 

 the body of a prey. In some suctorians, such as Choanophrya (Fig. 

 374, a), the tubular tentacles are clearly observable, and both solid 

 and liquid food materials are sucked in through the cavity. The 

 rapidity with which tentacles of a suctorian stop a very actively 

 swimming ciliate is attributed to a certain substance secreted by the 

 tentacles, which paralyses the prey. 



In the cytostome-bearing Mastigophora, the lashing of flagella 

 will aid in bringing about the food particles to the cytostome, where 



